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Ford 7.3 fuel. Is this a problem? #5169859 07/24/19 04:01 PM
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jfairchild327 Offline OP
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This is 4,000 miles on my 7.3. Is fuel dilution a problem here? Viscosity is low but this thing shears oil. Boron and potassium is left over from archoil

77E89B22-6595-49D2-94A4-2D609695320A.png
Last edited by jfairchild327; 07/24/19 04:02 PM.

2001 F250 7.3 powerstroke
1993 F250 7.3 turbo
1983 F250 6.9 483,000 miles and counting
Re: Ford 7.3 fuel. Is this a problem? [Re: jfairchild327] #5169880 07/24/19 04:30 PM
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demarpaint Offline
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Viscosity dropped to a 30 grade, wear #'s look OK. There's a lot of fuel going into the oil though. I would look into a possible problem with the injectors.


God Bless Our Troops

Re: Ford 7.3 fuel. Is this a problem? [Re: demarpaint] #5169893 07/24/19 04:41 PM
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jfairchild327 Offline OP
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I just wonder if they are reading the viscosity and getting a false reading or are they actually measuring fuel


2001 F250 7.3 powerstroke
1993 F250 7.3 turbo
1983 F250 6.9 483,000 miles and counting
Re: Ford 7.3 fuel. Is this a problem? [Re: jfairchild327] #5169894 07/24/19 04:42 PM
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The 7.3 don't shear oil I owned one a 2002. The fuel shouldn't be so high.


2015 F150 2.7
2018 F350 6.2
Re: Ford 7.3 fuel. Is this a problem? [Re: jfairchild327] #5169927 07/24/19 05:08 PM
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Colt45ws Offline
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Originally Posted by jfairchild327
I just wonder if they are reading the viscosity and getting a false reading or are they actually measuring fuel

They are doing it by gas chromatography so they actually measured the fuel.


-Colton
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Re: Ford 7.3 fuel. Is this a problem? [Re: jfairchild327] #5170004 07/24/19 07:03 PM
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A_Harman Offline
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You have the record for fuel dilution that I have seen in a UOA on BITOG.
5.3% in only 4000 miles. Needs to be dealt with.


1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
Re: Ford 7.3 fuel. Is this a problem? [Re: jfairchild327] #5170084 07/24/19 08:31 PM
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Injector o rings may be the first place to look.

A black fuel filter is a typical sign of blown injector o rings, but not always.

Re: Ford 7.3 fuel. Is this a problem? [Re: A_Harman] #5170125 07/24/19 09:12 PM
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Originally Posted by A_Harman
You have the record for fuel dilution that I have seen in a UOA on BITOG.
5.3% in only 4000 miles. Needs to be dealt with.



Nope. I do. I had 10 percent, actually it was more, but that's the cutoff in which they quit measuring.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Ford 7.3 fuel. Is this a problem? [Re: jfairchild327] #5170291 07/25/19 05:27 AM
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dnewton3 Offline
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When you suspect something is wrong, it's always nice to have a second sample. However, you'd have to have pulled it at the time. I learned this long ago; I always pull two samples so in case one gets lost or questions arise ...
That being said, it's likely that the fuel count is correct here given the method they use to assess.
Probably a leaking injector or injector o-rings.
Overall, the UOA shows no ill effects from the fuel concentration, but I'd not let that be a reason to ignore the issue.


BTW - the 7.3L will shear oil; it's still HEUI. It just won't shear it as quickly at the 6.0L because the 7.3L uses a different style of injector. The 7.3L only uses the oil pressure to actuate the intensifier for the injection event and subsequently uses a spring for the return stroke, whereas the 6.0L uses oil pressure on both sides to actuate the plunger. Hence the 6.0L uses the oil twice as much for the HEUI events. The 6.0L also is capable of more injection events per cycle, as the return spring system was deemed too slow. So the 6.0L will shear oil more quickly than a 7.3L. But make no mistake; a 7.3L will shear oil given time.

Last edited by dnewton3; 07/25/19 05:36 AM.

The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: Ford 7.3 fuel. Is this a problem? [Re: jfairchild327] #5170362 07/25/19 08:07 AM
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Google "7.3 Cody Test" that is one way to diagnose a high pressure oil leak on a 7.3.

Re: Ford 7.3 fuel. Is this a problem? [Re: motor_oil_madman] #5171635 07/26/19 07:33 PM
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Originally Posted by motor_oil_madman
Originally Posted by A_Harman
You have the record for fuel dilution that I have seen in a UOA on BITOG.
5.3% in only 4000 miles. Needs to be dealt with.



Nope. I do. I had 10 percent, actually it was more, but that's the cutoff in which they quit measuring.


Wow. Was that on your Cummins 6.7?


1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
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